Just downloaded the pxlr o matic app by autodesk. It seems really good!
I'd searched around a little for some shortcuts to help in doing this but I couldn't find anything satisfactory that included the ability to pull the rating off again for saving. I'd ended up coming up with this rather cheeky solution. Hopefully it helps you too! This is my first post in a while (I stopped blogging properly about 8 years ago!) It's strange coming back to it. Blogger feels very crusty and old by todays standards too.